Constantly coughing up clear phlegm?

For the past 4-5 years I have been coughing up clear phlegm. That is my only symptom. Clear. Phlegm.

It's worse in the morning. When I wake up, I'll occasionally have a sore throat until I cough up a large amount of phlegm. I'm always coughing up phlegm, and what's even worse is I have to sometimes spit it out in public on the ground, which is very disgusting. I do not have a runny nose or any of the other symptoms of post nasal drip, nor do I have the majority of the symptoms of COPD. I tried an antihistamine for about 6 months, and that did nothing. Besides coughing up phlegm, I never have the need to just cough. Plus, when I'm coughing up phlegm, it's not really coughing, it's more like a growl in the back of my throat. If I cough, it does nothing. What is this?

Have you seen a Dr regarding this? In the meantime I find that drinking hot boiled water helps break up the phlegm so its not as bad. But i def think you should go and see a Dr and get yourself assessed. xx